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American Mineralogist, Volume 91, pages 710–715, 2006 New mineral names* ANDREW J. LOCOCK,1 PAULA C. PIILONEN,2† T. SCOTT ERCIT,2‡ RALPH ROWE,2 AND UWE KOLITSCH3 1Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada 2Research Division, Canadian Museum of Nature, P.O. Box 3443, Stn. D, Ottawa, Ontario K1P 6P4, Canada 3Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, A-1090 Wien, Austria CALCIOPETERSITE* Olomouc, northern Moravia, Czech Republic. It forms as a result J. Sejkora, P. Novotný, M. Novák, V. Šrein, P. Berlepsch (2005) of the weathering of chalcopyrite and other copper sulÞ des, Calciopetersite from Domašov nad Bystřicí, northern Mora- and is associated with chrysocolla, a Ce-dominant analogue via, Czech Republic, a new mineral species of the mixite of petersite-(Y), malachite, allophane, goethite, lepidocrocite, group. Can. Mineral., 43, 1393–1400. chalcopyrite, pyrite, covellite, chalcocite and quartz. The name is derived from its composition and relationship to petersite-(Y), Calciopetersite forms translucent to transparent minute acicu- YCu6[(PO4)3](OH)6·3H2O. The holotype specimen is deposited lar crystals, up to 0.4 mm in length and 5–20 µm in width, with a in the mineralogical collection of the Natural History Museum, hexagonal outline, clustered in Þ ne radiating sprays (up to 0.1– National Museum, Prague, Czech Republic, under the number 0.5 mm). The mineral is brittle and soft (hardness not measured), P1p–20/2000. The mineral corresponds to IMA mineral no. olive green, light olive green streak, vitreous, nonß uorescent, 2001-004. with uneven fracture and no observed cleavage. Calciopetersite Discussion. The atomic proportions of Si in the empirical is pleochroic, light green with yellowish tint (O) to dark green formula are misstated in the abstract and in the text of the paper; (E), uniaxial positive with ω 1.674(5) and ε > 1.739 (~1.75) in the corrected value is given above. A.J.L. Na light (590 nm). An average of eight electron microprobe CU8(OH)12(SIO4)·8H2O analyses gave K2O 0.09, CaO 4.39, CuO 51.25, Y2O3 1.61, La2O3 K. Walenta, T. Theye, T. (2005) A new copper silicate mineral 0.64, Ce2O3 1.98, Pr2O3 0.25, Nd2O3, 1.40, Dy2O3 0.33, Yb2O3 from the Clara mine, Central Black Forest. Der Erzgräber, 0.21, Bi2O3 0.09, SiO2 0.52, P2O5 20.98, As2O5 2.70, H2O (calc.) 19, 1–4 (in German with English abstract). 12.45, sum 98.89 wt%, corresponding to (Ca0.58Y0.13Ce0.11Nd0.08 La0.04K0.02 Dy0.02Pr0.01Yb0.01)Σ1.00(Cu5.90Ca0.14)Σ6.04[(PO4)2.06(PO3 The secondary mineral was found on the dumps of the Clara OH)0.65 (AsO4)0.22(SiO4)0.08]Σ3.01OH)6·3.00 H2O on the basis of 21 mine, Central Black Forest, Germany. It forms bluish green to anions, ideally CaCu6[(PO4)2(PO3OH)](OH)6·3H2O. A single-crystal X-ray study showed the mineral to be a mem- turquoise crusts on ß uorite and quartz; the latter contains par- tially corroded galena. The crusts are Þ ne-grained, with angular ber of the mixite group: hexagonal, space group P63/m (inferred), a = 13.3045(18), c = 5.8711(8) Å, V = 900.0(4) Å3, but did not fragments seen at high magniÞ cation, and are partly composed permit reÞ nement of a structure model to an acceptable level of of spherulitic aggregates with a maximum diameter of 10 µm. precision. Powder diffraction data were collected with a Philips The mineral has a bluish green to turquoise streak, is translucent, APD diffractometer (3–66° 2θ, CuKα radiation) and yielded has a vitreous luster, and no discernible cleavage. The hard- reÞ ned unit cell parameters a = 13.284(4) Å, c = 5.902(4) Å, ness could not be determined accurately, but is estimated to be V = 902.0(6) Å3, and the strongest lines [d in Å (I,hkl)]: 11.51 approximately 2. The mineral is optically isotropic or weakly (100,100), 4.346 (88,210), 4.140 (46,201), 3.837 (38,300), 3.321 birefringent, nmean = 1.735 ± 0.003. The spherulitic aggregates (44,220), 3.184 (35,130), 2.888 (53,221), 2.877 (37,400), 2.510 show a radiating internal structure, with negative optical elon- gation. The optical properties infer cubic symmetry if the weak (37,140), and 1.965 (31,322). Density was not measured; Dcalc = 3.337 for the empirical formula, 3.179 g/cm3 for the idealized birefringence is considered as anomalous. formula and Z = 2. The infrared absorption spectrum (<0.05 mg Electron microprobe analyses (H2O by difference) gave CuO sample in KBr) is interpreted to be consistent with the presence 63.9, PbO 7.09, SiO2 4.15, SO3 0.52, H2O 24.34, sum 100.00 3– 2– wt%, corresponding to the empirical formula Cu8.23Pb0.33Si0.71S0.07 of H2O, PO4 , and PO3OH . Calciopetersite occurs in cavities in quartz veins at an aban- H27.67O24, on the basis of 24 O atoms. Neglecting Pb and S, the doned quarry near Domašov nad Bystřicí, 20 km northeast of idealized formula is Cu8(OH)12(SiO4)·8H2O for Z = 4, Dcalc = 3.74 g/cm3. The strongest lines of the unindexed powder pattern (57.3 mm * Before publication, minerals marked with an asterisk were approved by the Commission on New Minerals and Mineral camera, FeKα radiation, intensities visually estimated) include Names, International Mineralogical Association. 3.04(10), 2.74(3), 2.50(0.5), 2.15(3), 1.890(1), 1.573(10). The † E-mail: [email protected] pattern shows relations to those of andradite and pyrochlore, ‡ English translations of articles are available upon request from and can be indexed on the basis of a cubic cell with a = 12.20 T.S.E. ([email protected]) Å. However, the imperfect agreement between measured and 0003-004X/06/0004–710$05.00/DOI: 10.2138/am.2006.463 710 LOCOCK ET AL.: NEW MINERAL NAMES 711 calculated d-spacings may indicate a pseudocubic cell. Lack of current IMA amphibole nomenclature (Burke and Leake 2004; suitable material precluded a full and more accurate description Can. Mineral., 42, 1881–1883); the terms ß uorpargasite, ß uor- of the mineral, and therefore the authors did not submit a proposal paragasite and F-pargasite are not to be used. A.J.L. to the CNMMN IMA. U.K. KINGSTONITE* FLUOROPARGASITE* C.J. Stanley, A.J. Criddle, J. Spratt, A.C. Roberts, J.T. Szymański, M.V. Lupulescu, J. Rakovan, G.W. Robinson, J.M. Hughes M.D. Welch (2005) Kingstonite, (Rh,Ir,Pt)3S4, a new mineral (2005) Fluoropargasite, a new member of the calcic am- species from Yubdo, Ethiopia. Mineral. Mag., 69, 447–453. phiboles from Edenville, Orange County, New York. Can. Mineral., 43, 1423–1428. Kingstonite occurs as subhedral to anhedral, elongate, tabular inclusions between 15 and 40 µm in size in Pt-Fe alloys from Fluoropargasite occurs as stubby prismatic crystals up to 13 the Bir Bir river, Yubdo district, Wallaga province, Ethiopia. It cm in dimension. The mineral is brittle, has Mohs hardness of ~6, is opaque, has a metallic luster, black streak, is brittle with a is transparent to translucent in very thin fragments, black, gray subconchoidal fracture and one good cleavage parallel to [100]. 2 to greenish gray streak, vitreous, nonß uorescent, with perfect Indentation measurements gave VHN25 = 895 (871–920) kg/mm , {110} cleavage and a conchoidal fracture. Fluoropargasite is corresponding to a Mohs hardness of approximately 6. In plane biaxial positive, with α = 1.634(2), β = 1.642(2), γ = 1.654(2), polarized light, the mineral is pale brownish gray, has weak 2Vmeas = 68°, 2Vcalc = 79°, Y = b and Z ^ c = 24° (acute), dispersion birefringence and pleochroism, and has no internal reß ections. r > v, weak, pleochroic: X = colorless to light brown, Y = light It is weakly anisotropic, with weak to moderate rotation tints in brown, and Z = brown. An average of six electron microprobe dull gray and brown. Reß ectance percentages for Rmin and Rmax analyses of the type material gave SiO2 43.30, MgO 14.44, FeO in air (and in oil) are 47.2, 48.9 (33.2, 34.7) (470 nm), 48.4, 50.3 9.73, CaO 12.29, Al2O3 12.11, Na2O 2.88, TiO2 0.90, MnO 0.08, (34.3, 36.1) (546 nm), 49.1, 50.7 (35.0, 36.5) (589 nm), 49.8, K2O 0.91, V2O3 0.18, Cr2O3 0.01, F 2.71, Cl 0.12, O = (F + Cl) 51.0 (35.6, 36.7) (650 nm), respectively. – 1.17, H2O (calc.) 0.71, sum 99.20 wt%, corresponding to (Na0.75 Electron microprobe analyses [WDS, average of 20 analyses 2+ 3+ K0.17)Σ0.92(Ca1.94Na0.06)Σ2(Mg3.18 Fe 1.18Al0.50Ti0.10Fe 0.02V0.02 Mn0.01 )Σ5 on four grains (range)] gave Rh = 46.5 (46.5–46.9), Pt = 11.2 (Si6.39Al1.61)Σ8O22[F1.26(OH)0.71Cl0.03]Σ2, determined on the basis of (10.8–11.3), Ir = 16.4 (15.6–16.9), S = 25.6 (25.2–25.7), sum 13 cations and 24 anions (Schumacher 1997; Can. Mineral., 35, 99.7 wt%, corresponding to (Rh2.27Ir0.43Pt0.29)Σ2.99S4.01, based on 3+ 238–246) with Fe and OH calculated by stoichiometry, ideally 7 atoms pfu. The simpliÞ ed formula is (Rh,Ir,Pt)3S4 with Dcalc = 3 NaCa2(Mg4Al)Si6Al2O22F2.
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  • Thirty-Seventh List of New Mineral Names. Part 1" A-L

    Thirty-Seventh List of New Mineral Names. Part 1" A-L

    Thirty-seventh list of new mineral names. Part 1" A-L A. M. CLARK Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, UK AND V. D. C. DALTRYt Department of Geology and Mineralogy, University of Natal, Private Bag XO1, Scottsville, Pietermaritzburg 3209, South Africa THE present list is divided into two sections; the pegmatites at Mount Alluaiv, Lovozero section M-Z will follow in the next issue. Those Complex, Kola Peninsula, Russia. names representing valid species, accredited by the Na19(Ca,Mn)6(Ti,Nb)3Si26074C1.H20. Trigonal, IMA Commission on New Minerals and Mineral space group R3m, a 14.046, c 60.60 A, Z = 6. Names, are shown in bold type. Dmeas' 2.76, Dc~ac. 2.78 g/cm3, co 1.618, ~ 1.626. Named for the locality. Abenakiite-(Ce). A.M. McDonald, G.Y. Chat and Altisite. A.P. Khomyakov, G.N. Nechelyustov, G. J.D. Grice. 1994. Can. Min. 32, 843. Poudrette Ferraris and G. Ivalgi, 1994. Zap. Vses. Min. Quarry, Mont Saint-Hilaire, Quebec, Canada. Obschch., 123, 82 [Russian]. Frpm peralkaline Na26REE(SiO3)6(P04)6(C03)6(S02)O. Trigonal, pegmatites at Oleny Stream, SE Khibina alkaline a 16.018, c 19.761 A, Z = 3. Named after the massif, Kola Peninsula, Russia. Monoclinic, a Abenaki Indian tribe. 10.37, b 16.32, c 9.16 ,~, l~ 105.6 ~ Z= 2. Named Abswurmbachite. T. Reinecke, E. Tillmanns and for the chemical elements A1, Ti and Si. H.-J. Bernhardt, 1991. Neues Jahrb. Min. Abh., Ankangite. M. Xiong, Z.-S.
  • Design Rules for Discovering 2D Materials from 3D Crystals

    Design Rules for Discovering 2D Materials from 3D Crystals

    Design Rules for Discovering 2D Materials from 3D Crystals by Eleanor Lyons Brightbill Collaborators: Tyler W. Farnsworth, Adam H. Woomer, Patrick C. O'Brien, Kaci L. Kuntz Senior Honors Thesis Chemistry University of North Carolina at Chapel Hill April 7th, 2016 Approved: ___________________________ Dr Scott Warren, Thesis Advisor Dr Wei You, Reader Dr. Todd Austell, Reader Abstract Two-dimensional (2D) materials are championed as potential components for novel technologies due to the extreme change in properties that often accompanies a transition from the bulk to a quantum-confined state. While the incredible properties of existing 2D materials have been investigated for numerous applications, the current library of stable 2D materials is limited to a relatively small number of material systems, and attempts to identify novel 2D materials have found only a small subset of potential 2D material precursors. Here I present a rigorous, yet simple, set of criteria to identify 3D crystals that may be exfoliated into stable 2D sheets and apply these criteria to a database of naturally occurring layered minerals. These design rules harness two fundamental properties of crystals—Mohs hardness and melting point—to enable a rapid and effective approach to identify candidates for exfoliation. It is shown that, in layered systems, Mohs hardness is a predictor of inter-layer (out-of-plane) bond strength while melting point is a measure of intra-layer (in-plane) bond strength. This concept is demonstrated by using liquid exfoliation to produce novel 2D materials from layered minerals that have a Mohs hardness less than 3, with relative success of exfoliation (such as yield and flake size) dependent on melting point.
  • 35Th International Geological Congress

    35Th International Geological Congress

    ............................... 3 NO. 59 QUARTERLY NEWS BULLETIN ~ SEPTEMBER 2 0 1 6 VOLUME ..................... 35TH INTERNATIONAL GEOLOGICAL CONGRESS 27 AUGUST - 4 SEPTEMBER 2016 I CAPE TOWN, SOUTH AFRICA UCT du Toit lecture Pre-IGC field trips Mineral Scene ................................................................................................................................................................................................... GeoBulletin_Expression Form (A4)_OUTLINES CREATED.indd 1 2013/09/13 03:14:51 PM 35TH INTERNATIONAL GEOLOGICAL CONGRESS 27 AUGUST - 4 SEPTEMBER 2016 | CAPE TOWN, SOUTH AFRICA 35TH INTERNATIONAL GEOLOGICAL CONGRESS 27 AUGUST - 4 SEPTEMBER 2016 | CAPE TOWN, SOUTH AFRICA The International Geological Congress (IGC) is the principal event of the International Union of Geological Sciences (IUGS), one of the largest and most active non-governmental scientific organizations in the world. The IUGS promotes and encourages the study of geological phenomena, especially those of worldwide significance, and supports and facilitates international and interdisciplinary cooperation in the earth sciences. The event will be a Pan African experience with the support of the major African geoscientific societies and related organisations. A large number of African delegates are expected to attend and field trips are planned to all parts of the African continent. The Congress will have a very extensive Thetechnical International programme, Geological Congress featuring (IGC) is the papers,principal event posters, of the International short courses Union of Geological and Sciences (IUGS), one of the largest and most active non-governmental scientific organizations in the world. workshops. Principal themes are: GeoscienceThe IUGS in promotes Society, and encourages Geoscience the study in of the geological Economy phenomena, and especially Fundamental those of worldwide significance, and supports and facilitates international and interdisciplinary cooperation in the earth Geoscience.